Chameleon belief blends into background
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Tipple's status topples over proof
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Redheads' 'extinction' explanation splitting hairs
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Regrowth mystery reborn
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If you're only as old as you feel then are you as old as your body? The idea that body cells regrow every seven years should be an accurate guide, right? Wrong! Dr Karl can sense it in his bones.

Deaf cats draw a blanc
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